Trestle



Nov.A 1, 1927. 1,617,432 a G. D. BUTLER TRESTL Filed March s. 192e 2 sheets-sheet 1 Nov. l, 1927. 1,647,432

G. D. BUTLER TRESTLE Filed March 5. 1926 2 Sheets-Sheet 2 Patented Nov. Y l TL?.

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esoneri io. Barranca riarnpirsfennegnnw .innsnn TRESTLE.

Application fiIed March 3, 1926. Serial No. 92,0615.

This invention aims to provide a simple means whereby the height of la trestle ymay be adjusted.

Tt is within the province of the disclosure to improve generally and to enhance the utility of devices of that' type to which the invention appertains;

TWith the above and other objects in view Vwhich will appear as the description pro, l. ceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the' invention herein disclosed, may be made within the scope of what isclaimed, withV out departing from the spirit of the invention.

In the drawings Figure 1 shows in top plan, a trestle constructed in accordance with the invention;

Figure 2 is a section on the line 2-2 of Figure 1; y

Figure 3.is an end elevation;

Figure 4 isa side elevation;

Figure 5 is across section taken about on the line 5 5 of Figure 4, some parts` 5 extend between the side members 2.' Thebearings 5 preferably are in the form of blocks. They are supported on the lower V'flanges 4. At `one side, and at its outer end,

each bearing block 5 has an upstanding wing 6. The wing 6 extends upwardly into p engagement with one of the upper flanges f This strengthens the trestle. The frame 1 includes diverging legs 7., The` upper '59 ends of the legs 7 are connected by securing devices 8 to the side members 2. The securing 'devices 8 also engage and hold in place the bearing blocks 5. y

Supports 9, in the form of screws, extend f- Figure 6 is a horizontal section talren The side members 2 have updownwardly through the bearing` blocks 5.r

The screws 9 are not threaded into the bear` ing blocks 5. The screws 9, however, are threaded into worm wheels 10. VThe 'worm' wheels 10 rest on the. 'bearing blocks 5. The flanges 3 overhang the worm wheels l() and hold them down, without interfering with Y their rotation. The worm wheels 10 coopcrate with .worms 11. The wormsll are ona horizontal shaft 12. The shaft 12 is journaled in the'wings 6. It is housed beneath one of the flanges 3. The shaft 12 hasA squared ends 14, so that it can be turned readily by a` key or crank (not shown). There are bearings 15 on'the upper ends of the screws 9. In the bearings 15 are jour` 11a-led trunnioiis 16 at the end` of a roller 17.

vSet screws 18 are threaded into the bearings 15.` The set screws 18inay be made to bear on the trunnions 16 thus hold the roller 17 against turning, in the' eventthatthe operator has no use for a roller. The roller then becomes a rigid. connection between thev upper ends of the screws 9.

The shaft 12 vmay beA rotated,frotation bcing imparted to the worms 11, Ythe worm wheels 10 being-rotated, and the supports- V9, with the roller 17, being raised or lowered, as occasion may demand.l

That is claimed is Y 1. InV a device of the class described, ay frame comprising spaced channel members includingupper and lower flanges, a bearing supported on the llower flanges and provided n with a wing yengaging .one of the upper flanges for reinforcement, ,a 'screw located between the channel members and movable longitudinally in the bearing, a worm wheel whereinto' the screw isv threaded, the wormV wheel being retained between the bearing and the upper fianges, a work-supporting means mounted yon the screw, and a shaft having a -worm meshing with thefworm wheel, the shaft being journaled in the wing,`

vand housed beneath one of theupper flanges.

v2.v Tn a device of the class described, a frame comprising spaced channel members including vupper and lower flanges, bearings I movable longitudinally in the bearings, Wheels Whereinto the Screws are threaded, the Worm Wheels being retained between the bearings and the upper flanges,

Work-supporting means on the screws. a -shaft having `Worms meshing With the Worm Wheels, the shaft being housed beture.

GEORGE D. BUTLER. 

